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Author Topic: Math help !  (Read 1473 times)

Offline Ghost Of Highbury

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Math help !
« on: May 17, 2009, 01:50:15 pm »
Hello all..
i'm stuck in 2008 oct/nov math paper 4 q 9)a)

i am not able to fin "r"
plz find attached paper
thank you
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Offline Ghost Of Highbury

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Re: Math help !
« Reply #1 on: May 17, 2009, 01:54:00 pm »
is anyone dere??
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Offline astarmathsandphysics

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Re: Math help !
« Reply #2 on: May 17, 2009, 02:01:42 pm »
Am not home until late. He someone else tries good
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Offline X Abdulrahman X

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Re: Math help !
« Reply #3 on: May 17, 2009, 02:03:09 pm »
notice at the top is says "100 students"

if u get p and q, u add up all the numbers inside the circles which should add up to 99, add 1 lonely guy left  :P
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Offline Enia

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Re: Math help !
« Reply #4 on: May 17, 2009, 02:07:14 pm »
for p you have to add 12+17+8 you get 37. subtract that from 42 (because they said 42 students like swimming)

Then they said 40 people like only ONE sport that means you add 20+8 (28) and subtract from 40

for r add everything in the circles (u get 99) than means only one person doesn't like any sports.
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Offline joel

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Re: Math help !
« Reply #5 on: May 17, 2009, 02:15:47 pm »
It says 42 students like swimming so
42=12+8+17+p
So p=5
40 students like only one sport so
40=q+20+8
So q=12
There are total 100 so add all the no the subtract from 100
you will get 1
r=1
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Offline Ghost Of Highbury

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Re: Math help !
« Reply #6 on: May 17, 2009, 02:16:53 pm »
ohh.tks a lot
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Offline susman

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Re: Math help !
« Reply #7 on: May 17, 2009, 02:53:18 pm »
and yeah what about the c and e part?
need help...
thanks in advance
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Offline care

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Re: Math help !
« Reply #8 on: May 17, 2009, 03:03:00 pm »
c)i) B' contains everything that is not in the B set. So, n(B')=8+p+q+r=26
c)ii) B?F contains 20, 25, 12, 17, p, q.
S' contains 20, 25, q, r.
(B?F)?S? contains elements that are contained in both - B?F and S'.
So, n((B?F)?S?)=20+25+q=57
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Offline Ghost Of Highbury

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Re: Math help !
« Reply #9 on: May 17, 2009, 03:07:37 pm »
i onle got c i and e

c)i) n(B') means you don't take the whole of set B into consideration...therefore u r left with p q 8 and r..add them up
= 26

e)the total no. of people who like basketball are 74...12 of them also like swimming and 25 of them also like futball...so 25+12=37
the probability 4 the 1st student is 37/74
the probability for the 2nd is 36/73
multiply them
and u get 18/73



« Last Edit: May 17, 2009, 03:12:51 pm by eddie_adi619 »
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